Enabled VSync & added setting.

cmd/tins2020/tins2020.go

@@ -47,7 +47,14 @@ func run() error {
 	if ctx.Settings.Window.Size == nil {
 		ctx.Settings.Window.Size = tins2020.PtPtr(800, 600)
 	}
+	if ctx.Settings.Window.VSync == nil {
+		vsync := true
+		ctx.Settings.Window.VSync = &vsync
+	}
 
+	if *ctx.Settings.Window.VSync {
+		sdl.SetHint(sdl.HINT_RENDER_VSYNC, "1")
+	}
 	sdl.SetHint(sdl.HINT_RENDER_SCALE_QUALITY, "1")
 	window, err := sdl.CreateWindow("TINS 2020",
 		ctx.Settings.Window.Location.X, ctx.Settings.Window.Location.Y,

settings.go

@@ -32,4 +32,5 @@ func (s *Settings) Store() error {
 type WindowSettings struct {
 	Location *Point
 	Size     *Point
+	VSync    *bool
 }